A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.
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As as people thought that they were doing the will of God through violence, well, suddenly there's a sanction for violence that has almost a universal adapter.
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Another war in the Middle East. A retreat from the international order. A presidency built on self-dealing and arbitrary power. It's enough to make you think the U.S. is in a steep decline — but Fareed Zakaria thinks otherwise.
Freakonomics Radio
For most of human history, people were infected with intestinal worms as a matter of course. It's only in the past century, in wealthy countries, that mass deworming campaigns and improved sanitation removed them from virtually the entire population. Now some researchers think that eliminating these ancient passengers may have contributed to a sharp rise in autoimmune and allergic diseases.
Radiolab